mrmBot-Matrix/natives/squish.cc

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#include "common.h"
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#include <math.h>
#include <vips/vips8>
using namespace std;
using namespace vips;
char *Squish(string *type, char *BufferData, size_t BufferLength,
ArgumentMap Arguments, size_t *DataSize) {
VOption *options = VImage::option();
VImage in =
VImage::new_from_buffer(
BufferData, BufferLength, "",
*type == "gif" ? options->set("n", -1)->set("access", "sequential")
: options)
.colourspace(VIPS_INTERPRETATION_sRGB);
if (!in.has_alpha())
in = in.bandjoin(255);
int width = in.width();
int pageHeight = vips_image_get_page_height(in.get_image());
int nPages = *type == "gif" ? vips_image_get_n_pages(in.get_image()) : 30;
double mult = (2 * M_PI) / nPages;
vector<VImage> img;
for (int i = 0; i < nPages; i++) {
VImage img_frame =
*type == "gif" ? in.crop(0, i * pageHeight, width, pageHeight) : in;
double newWidth = (sin(i * mult) / 4) + 0.75;
double newHeight = (cos(i * mult) / 4) + 0.75;
VImage resized =
img_frame.resize(newWidth, VImage::option()->set("vscale", newHeight))
.gravity(VIPS_COMPASS_DIRECTION_CENTRE, width, pageHeight);
img.push_back(resized);
}
VImage final = VImage::arrayjoin(img, VImage::option()->set("across", 1));
final.set(VIPS_META_PAGE_HEIGHT, pageHeight);
if (*type != "gif") {
vector<int> delay(30, 50);
final.set("delay", delay);
}
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void *buf;
final.write_to_buffer(".gif", &buf, DataSize);
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*type = "gif";
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vips_error_clear();
vips_thread_shutdown();
return (char *)buf;
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}